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2017 ; 375
(2103
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
On the effective stress law for rock-on-rock frictional sliding, and fault slip
triggered by means of fluid injection
#MMPMID28827423
Rutter E
; Hackston A
Philos Trans A Math Phys Eng Sci
2017[Sep]; 375
(2103
): ä PMID28827423
show ga
Fluid injection into rocks is increasingly used for energy extraction and for
fluid wastes disposal, and can trigger/induce small- to medium-scale seismicity.
Fluctuations in pore fluid pressure may also be associated with natural
seismicity. The energy release in anthropogenically induced seismicity is
sensitive to amount and pressure of fluid injected, through the way that seismic
moment release is related to slipped area, and is strongly affected by the
hydraulic conductance of the faulted rock mass. Bearing in mind the scaling
issues that apply, fluid injection-driven fault motion can be studied on
laboratory-sized samples. Here, we investigate both stable and unstable induced
fault slip on pre-cut planar surfaces in Darley Dale and Pennant sandstones, with
or without granular gouge. They display contrasting permeabilities, differing by
a factor of 10(5), but mineralogies are broadly comparable. In permeable Darley
Dale sandstone, fluid can access the fault plane through the rock matrix and the
effective stress law is followed closely. Pore pressure change shifts the whole
Mohr circle laterally. In tight Pennant sandstone, fluid only injects into the
fault plane itself; stress state in the rock matrix is unaffected. Sudden access
by overpressured fluid to the fault plane via hydrofracture causes seismogenic
fault slips.This article is part of the themed issue 'Faulting, friction and
weakening: from slow to fast motion'.